. >> speaking of legal standards, the decision was made to not read dzhokhar tsarnaev his miranda rights, at least not yet. can you explain a little bit more about that decision? i think a lot of people and others who expect when you get arrested you get yourmy r miran rights are surprised by this decision. >> to break down, everybody has seen when police arrest you, they always say certain words. which include you have the right to remain silent, anything you say can and will be used against you in a court of law. well they didn't do that in the case of this suspect. that's because there's something called a public safety exception. and the public safety exception simply says that if you're concerned that there's a plot that is still afoot, if you're concerned there's an emergency, that there could be bombs somewhere else, the authorities don't have to read you your rights at that time. and that's basically what they have decided to do. but they are still going to have to do it eventually. >> joe johns, thank you so much. >>> it's one of the most visible signs that boston is beginning t